| 摘要 |
PROBLEM TO BE SOLVED: To calculate an interest rate of a credit transaction according to an investor's transaction result.SOLUTION: In a security transaction system 3, a customer class calculation unit 34A identifies a customer class by referring to a stock order DB35C, commitment information DB35D, a credit open interest balance DB35E and a spot balance DB35F, and sets the customer class to customer information DB35A or the credit open interest balance DB35E. An interest calculation unit 34B identifies an open interest class by referring to the commitment information DB35D, and sets the open interest class to the credit open interest balance DB35E. At the same time, the interest calculation unit calculates an interest rate of the day on the basis of the customer class or the open interest class, the number of days of possession of the credit open interest balance DB35E and the amount of the open interest, and an applicable interest rate of an interest scheme DB35B, makes the interest rate into the day's interest rate, and sets an amount which is obtained by adding the day's interest rate to a cumulative interest rate to the credit open interest balance DB35E as a cumulative interest. |
